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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2020 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_NET_PROCESSING_H
#define BITCOIN_NET_PROCESSING_H
#include <consensus/params.h>
#include <net.h>
#include <sync.h>
#include <validationinterface.h>
class BlockValidationState;
class CBlockHeader;
class CChainParams;
class CTxMemPool;
class ChainstateManager;
extern RecursiveMutex cs_main;
extern RecursiveMutex g_cs_orphans;
/** Default for -maxorphantx, maximum number of orphan transactions kept in memory */
static const unsigned int DEFAULT_MAX_ORPHAN_TRANSACTIONS = 100;
/** Default number of orphan+recently-replaced txn to keep around for block reconstruction */
static const unsigned int DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN = 100;
static const bool DEFAULT_PEERBLOOMFILTERS = false;
static const bool DEFAULT_PEERBLOCKFILTERS = false;
/** Threshold for marking a node to be discouraged, e.g. disconnected and added to the discouragement filter. */
static const int DISCOURAGEMENT_THRESHOLD{100};
class PeerManager final : public CValidationInterface, public NetEventsInterface {
public:
PeerManager(const CChainParams& chainparams, CConnman& connman, BanMan* banman,
CScheduler& scheduler, ChainstateManager& chainman, CTxMemPool& pool);
/**
* Overridden from CValidationInterface.
*/
void BlockConnected(const std::shared_ptr<const CBlock>& pblock, const CBlockIndex* pindexConnected) override;
void BlockDisconnected(const std::shared_ptr<const CBlock> &block, const CBlockIndex* pindex) override;
/**
* Overridden from CValidationInterface.
*/
void UpdatedBlockTip(const CBlockIndex *pindexNew, const CBlockIndex *pindexFork, bool fInitialDownload) override;
/**
* Overridden from CValidationInterface.
*/
void BlockChecked(const CBlock& block, const BlockValidationState& state) override;
/**
* Overridden from CValidationInterface.
*/
void NewPoWValidBlock(const CBlockIndex *pindex, const std::shared_ptr<const CBlock>& pblock) override;
/** Initialize a peer by adding it to mapNodeState and pushing a message requesting its version */
void InitializeNode(CNode* pnode) override;
/** Handle removal of a peer by updating various state and removing it from mapNodeState */
void FinalizeNode(NodeId nodeid, bool& fUpdateConnectionTime) override;
/**
* Process protocol messages received from a given node
*
* @param[in] pfrom The node which we have received messages from.
* @param[in] interrupt Interrupt condition for processing threads
*/
bool ProcessMessages(CNode* pfrom, std::atomic<bool>& interrupt) override;
/**
* Send queued protocol messages to be sent to a give node.
*
* @param[in] pto The node which we are sending messages to.
* @return True if there is more work to be done
*/
bool SendMessages(CNode* pto) override EXCLUSIVE_LOCKS_REQUIRED(pto->cs_sendProcessing);
/** Consider evicting an outbound peer based on the amount of time they've been behind our tip */
void ConsiderEviction(CNode& pto, int64_t time_in_seconds) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
/** Evict extra outbound peers. If we think our tip may be stale, connect to an extra outbound */
void CheckForStaleTipAndEvictPeers(const Consensus::Params &consensusParams);
/** If we have extra outbound peers, try to disconnect the one with the oldest block announcement */
void EvictExtraOutboundPeers(int64_t time_in_seconds) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
/** Retrieve unbroadcast transactions from the mempool and reattempt sending to peers */
void ReattemptInitialBroadcast(CScheduler& scheduler) const;
/** Process a single message from a peer. Public for fuzz testing */
void ProcessMessage(CNode& pfrom, const std::string& msg_type, CDataStream& vRecv,
const std::chrono::microseconds time_received, const std::atomic<bool>& interruptMsgProc);
private:
/**
* Potentially mark a node discouraged based on the contents of a BlockValidationState object
*
* @param[in] via_compact_block this bool is passed in because net_processing should
* punish peers differently depending on whether the data was provided in a compact
* block message or not. If the compact block had a valid header, but contained invalid
* txs, the peer should not be punished. See BIP 152.
*
* @return Returns true if the peer was punished (probably disconnected)
*/
bool MaybePunishNodeForBlock(NodeId nodeid, const BlockValidationState& state,
bool via_compact_block, const std::string& message = "");
/** Maybe disconnect a peer and discourage future connections from its address.
*
* @param[in] pnode The node to check.
* @return True if the peer was marked for disconnection in this function
*/
bool MaybeDiscourageAndDisconnect(CNode& pnode);
/** Process a single headers message from a peer. */
void ProcessHeadersMessage(CNode& pfrom, const std::vector<CBlockHeader>& headers, bool via_compact_block);
const CChainParams& m_chainparams;
CConnman& m_connman;
/** Pointer to this node's banman. May be nullptr - check existence before dereferencing. */
BanMan* const m_banman;
ChainstateManager& m_chainman;
CTxMemPool& m_mempool;
int64_t m_stale_tip_check_time; //!< Next time to check for stale tip
};
struct CNodeStateStats {
int m_misbehavior_score = 0;
int nSyncHeight = -1;
int nCommonHeight = -1;
std::vector<int> vHeightInFlight;
};
/** Get statistics from node state */
bool GetNodeStateStats(NodeId nodeid, CNodeStateStats &stats);
/** Relay transaction to every node */
void RelayTransaction(const uint256& txid, const uint256& wtxid, const CConnman& connman) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
#endif // BITCOIN_NET_PROCESSING_H
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